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When engaged, an automatic wire stripper simultaneously grips the wire from one side and cuts and removes the insulation from the other. To use it, one simply has to place the wire in the jaws and squeeze the handle. While this device allows even a novice to strip most wires very quickly, it does have some drawbacks.
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We wanted to know if the length of time food is in contact with a contaminated surface affected the rate of transfer of bacteria to the food.To find out, we inoculated squares of tile, carpet or wood with Salmonella. Five minutes after that, we placed either bologna or bread on the surface for five, 30 or 60 seconds, and then measured the amount of bacteria transferred to the food. We repeated this exact protocol after the bacteria had been on the surface for two, four, eight and 24 hours.We found that the amount of bacteria transferred to either kind of food didn��t depend much on how long the food was in contact with the contaminated surface �C whether for a few seconds or for a whole minute.